Attachment B - Engineering Technical Note · 132008.1128.04

                                                                 SUNRISE BEACH RETIREMENT AND AGED CARE DEVELOPMENT




                                                                                                                            CONTINUED


TRAFFIC AND MOVEMENT NETWORK
A traffic technical memo was prepared to support the previous minor change application in 2018. The technical memo assessed
performance of the Ben Lexcen Drive/Lipton St/Grasstree Court intersection to the north of the site. The assessment returned
level of Service A under both the AM and PM peak hour scenarios.
The analysis was based on the current approval traffic generation as follows:
Table 2: Traffic Generation Comparison
                    Traffic
                                          Current Approval                    Proposed Design                   Net Change
                  Generation
                 0.4 trips per                          91 trips per                        93 trips per      2 trips per
 Peak Hour
                 bed/dwelling            226               hour              232               hour              hour
                                                                                                                                 2.5%
                                    Beds/Dwellings                      Beds/Dwellings
                   2.1 per                              475 trips per                      487 trips per     12 trips per
 Daily Traffic
                 bed/dwelling                               day                                day               day

The above analysis was based on the whole of the development site, which includes both the aged care facility and the
retirement living site. The aged care facility contributed 96 of the 226 beds/dwellings, which is now proposed to increase to 102
(from 96).
The net increase of 2 trips per hour in the peak (2.5% additional development traffic) will have negligible effect on the
performance of the Ben Lexcen Drive/Lipton Street/Grasstree Court roundabout.
Swept path assessment
Drawing 5000-SK-004(A) attached demonstrates the swept path movements for vehicles entering and leaving the site. The key
movement is the waste collection vehicle using the service area at the south eastern corner of the site.
A waste management plan for the site has been prepared and approved under OPW19/0047 which nominated a rear lift waste
collection vehicle. This vehicle has been used in preparing the swept path plans
An analysis of vehicle movements into the carpark area is also shown on the drawing.
STORMWATER MANAGEMENT
The proposed redesign does not fundamentally affect the proposed stormwater management for the site.
Importantly, the stormwater network and treatment systems have been approved under OPW19-0020. This approval included a
50m2 bio basin and 45m2 infiltration basin located along the northern boundary of the site. These basins have been retained in
the proposed design, albeit with minor reshaping of the bio basin.
The stormwater network is shown on drawing 5002-106(B) and 5002-400(B). A change application for OPW19-0200 will be
required in the future to reflect the changes to the stormwater basins.
WATER AND SEWERAGE
A Water and Wastewater Network Investigation (18-001942-WER01(B)) was prepared by Calibre for the development in
December 2018 which identified a requirement for an additional 150mm watermain in Grasstree Court.
The proposed design results in a reduction in GFA, but a marginal increase in number beds. A comparison of the approved
design vs the proposed design is provided in Table 3 below.
Table 3: Water and Sewerage EP comparison
                                         Current Approval                                       Proposed Design
                                                                          Total EP+10%                                         Net
Land Use                 EP/Dwelling         Quantity        Total EP                          Quality      Total EP
                                                                          Contingency                                       Change EP
                                                                                                122
Attached Dwellings            1.8          122 dwelling        219.6            242                           219.6             0
                                                                                              Dwellings
                        3.56EP/100m2
Aged Care Facility                           6,565m2           233.7            257           6,440m2         229.3            -4.4
                            GFA
                        3.13EP/100m2
Community Facility                           2,985m2            93.4            103           2,985m2          93.4             0
                            GFA
Total                                                          546.7            602                           542.3          -4.4EP




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